JP2015003277A - Method for treating spray mists of uv coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treatment method for separating the spray mists of a UV coating material into water and sludge and collecting the sludge.SOLUTION: In a method for collecting the spray mists of a UV coating material, a method for treating the spray mists of the UV coating material includes the steps of: directly bringing the spray mists into contact with water at high speed to cause collision with the water or bringing the spray mists into contact with the water by a method such as a shower, thereby collecting the spray mists; and when separating solids, applying ultraviolet rays into the water in a tank storing the water for collecting the spray mists of the UV coating material, thereby curing, coagulating and solidifying, in the water, the spray mists of the UV coating material dispersed and floated in the water. In the method for treating the spray mists of the UV coating material, the spray mists of the UV coating material dispersed and floated in the water in the tank storing the water used upon the separation and collection of the solids are agitated together with the water, and thereby the ultraviolet rays are uniformly applied to the spray mists of the UV coating material, so that the spray mists are more effectively cured, coagulated and solidified.

Description

The present invention relates to a method of coating UV paint that is cured by irradiating with ultraviolet rays, and when collecting surplus paint spray mist, it is brought into contact with water at high speed and collided with the spray mist. The present invention relates to a method for treating a spray mist of UV paint, which comprises a step of collecting and a step of subsequently separating the spray mist from water as a solid content.

2. Description of the Related Art Conventionally, in the fields of metal coating, plastic coating, and the like, a method of spraying a UV coating that is cured by irradiating ultraviolet rays is known for coating an object to be coated.
In such a method, not all of the actually sprayed paint is applied to the object to be coated, but 20 to 80% is not applied and becomes an excess paint spray mist.

Since such a surplus paint spray mist cannot be left as it is, it is necessary to collect the paint mist and perform some processing, and a method for collecting the surplus paint spray mist (hereinafter simply referred to as paint mist). As a rule, many paint booths (wet paint booths) are used.
This painting booth (wet painting booth) is equipped with a device to treat paint mist, and prepares a pool that stores tap water, industrial water, groundwater, etc. as circulating water, and contacts and collects paint mist there. A method of treating paint mist by the above is known.

In order to separate the paint mist mixed in the circulating water from the water as a solid content, in the case of general paint, add a flocculant (alkaline chemical or acidic chemical) to the circulating water, and then add a modifier to remove the paint mist. Solidified and sludged.

However, UV paints are designed to react to ultraviolet rays, and there are no coagulants and modifiers effective for solidification. Even if the paints are relatively compatible with the paint mist, In order to exert its effect, it is necessary to always manage the concentration of the drug contained in the circulating water correctly, and even if it is skillful, it always suffers from strong viscosity and strong odor. Currently.

The sludge treated by the conventional UV paint mist treatment method adheres to or clogs the piping, filters, pumps, piping, etc., such as the path for reusing the circulating water, and normal equipment failure occurs. It has become. (See Patent Document 1)

The water used in the conventional wet painting booth of the above method is simply city water, industrial water, groundwater, or the like.

JP-A-5-192696

The present invention relates to a method of applying UV paint that is cured by irradiating ultraviolet rays, and when spray mist is collected, the spray mist is collected by directly contacting and colliding with water at high speed. And a process for treating the spray mist of the UV paint, characterized by comprising a step of separating the spray mist from water as a solid content.

According to the method of treating paint mist using circulating water in a conventional painting booth, the paint mist aggregates into a sludge state with fine paint particles gathered together, and this sludge is always strong as described above. It is sludge with a good viscosity and odor remaining.
Such sludge is difficult to handle, and because of its strong viscosity, automation of sludge recovery is difficult and slow, and sludge separation and recovery is dependent on the manual work of the worker, and the labor load is enormous.

The present invention is as follows.
(1)
In a method of collecting excess paint spray mist generated during spray coating of UV paint (hereinafter referred to as UV paint) that is cured by irradiating with ultraviolet rays, the spray mist is collected in water. And a step of subsequently irradiating ultraviolet rays (ultraviolet rays) to the water that collects the spray mist to cause a curing reaction in the water to cause aggregation and solidification, and separating the solid content. A method for treating spray mist of UV paint.
(2)
2. The method for treating a spray mist of UV paint according to claim 1, wherein the step of collecting the spray mist in water includes a step of directly bringing the spray mist into contact with water and colliding it with water. .
(3)
The step of separating the solid content of the UV paint irradiates ultraviolet rays toward the water that collects the spray mist in a tank that stores and flows water for collecting the spray mist. 3. The method of treating a UV paint spray mist as described in 1 or 2 above, comprising the steps of curing the UV paint mist dispersed and suspended in water by water, aggregating and solidifying the UV paint mist.
(4)
In the UV paint spray mist processing method according to 3 above, the UV paint mist dispersed and suspended in water by stirring the water collecting the spray mist is uniformly irradiated with ultraviolet rays, and more effective. A process for treating a spray mist of UV paint, characterized by comprising a step of hardening, coagulating and solidifying.
(5)
5. The UV mist spray mist processing method according to any one of 1 to 4 above, wherein the water from which the solid content has been separated is circulated and reused.
(6)
6. The UV mist spray mist according to any one of 1 to 5 above, wherein the water contains strong alkaline electrolyzed water and has a pH of 9 or more and an ORP of 200 mV or less. Processing method.

According to the present invention, UV paint mist is brought into direct contact with water at high speed to collide and stir, and further, UV rays are dispersed and suspended in water by irradiating ultraviolet rays toward the water in a storage tank. The UV paint spray mist is cured in water by agglomeration and solidification, and the UV paint spray mist dispersed and suspended in the water is stirred together with water to produce UV ( UV rays are uniformly irradiated, and are more effectively cured, agglomerated and solidified, and the UV paint spray mist can be efficiently processed.

According to the treatment process of the present invention, it is possible to provide a better working environment and the surrounding environment without spreading bad odor to the surrounding environment by further curing, agglomerating and solidifying, and the separated paint sludge It is much easier to separate each manually or automatically, and the separated paint sludge has very good dewaterability and can be used as a secondary material such as cement after concentration and drying.

The figure which shows the cross section of the spray mist processing apparatus of the stirring mixing type UV coating material which concerns on one Embodiment of this invention. The top view which shows the flow of the circulating water of FIG. 1, FIG. 3, a stirrer, and an ultraviolet irradiation device. The figure which shows the cross section of the spray mist processing apparatus of the shower type UV coating material which concerns on one Embodiment of this invention. The figure which shows the sample image of the spray mist of the UV coating material disperse | distributed and suspended in water. The figure which shows the sample image of the spray mist of the UV coating material which hardened | cured and aggregated and solidified in water. Photo in Figure 5

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a UV mist spray mist treatment apparatus including a medium / small-sized spray apparatus according to an embodiment.
As shown in the figure, the processing apparatus includes a storage tank 4, an exhaust fan 15 of a scrubber (suction / exhaust tower) 6, an ultraviolet irradiator 11, and a stirrer 10.

The spray mist 2 of the oversprayed UV paint is placed at the bottom of the scrubber 6 together with the circulating water 5 filled in the air flow 12 created by the exhaust fan 15 of the scrubber (suction / exhaust tower) 6 and filled in the storage tank 4. Air is strongly sucked from the provided gap 7, and the mixing and stirring unit 8 mixes the air, the spray mist of the UV paint, and the circulating water.
Water containing surplus paint spray mist is sucked into a scrubber (suction / exhaust tower) 6, collides with an eliminator (collision plate) 28 provided on the inner wall, falls as a water droplet 13, and falls from the outlet 9. Migrate to the floating tank 29 (storage tank 4).

Further, in the processing device called the shower booth in FIG. 3, the surplus paint spray mist 2 riding on the air flow 12 in the shower room (see 27 in FIG. 3) contacts and mixes with the shower 22 of the circulating water. Then, it is knocked off and migrates to the floating tank 29 (storage tank 4).
At the same time, when the air flow 12 generated by the exhaust fan 15 passes through an eliminator (collision plate) 23 provided in the shower chamber, water containing excess paint spray mist falls as water droplets and falls into a floating tank 29 (storage tank). Move to 4).

The ultraviolet irradiator 11 is attached to the outside of the floating tank 29, and the ultraviolet rays irradiate the water through the glass attached below the surface of the water.

As shown in FIG. 2, the circulating water stream 17 that circulates in the floating tank 29 is agitated by the agitator 10 that is rotated by the agitating motor 16, and the circulating water 5 that contains excess paint spray mist rotates in front of the ultraviolet irradiator 11. By passing, the excess paint spray mist can be uniformly cured.

The floating tank 29 is provided with a weir 18 that is lowered from the bottom of the water tank by about ¼ from the water surface, and a weir 23 that is below the top of the tank and is raised by about ¼ from the bottom of the water tank.

When the sludge that is agglomerated and solidified due to the curing reaction of the spray mist of UV paint is carried by the circulating water stream 17, the sludge that floats is blocked by the weir 18, the sludge that settles is blocked by the weir 23, and the sludge stays upstream and accumulates. Therefore, it can be discharged automatically or manually.

The inventor makes UV paint spray mist directly contact with water at high speed, or collide with a shower or the like to stir, and further irradiate ultraviolet rays toward the water in a storage tank. The UV mist spray mist dispersed and suspended in water is cured, aggregated and solidified in water, and the UV mist spray mist dispersed and suspended in water is stirred together with water. The spray mist is uniformly irradiated with ultraviolet rays, and more effectively cures, agglomerates and solidifies, and finds a treatment method that can efficiently treat the spray mist of UV paint. It has been completed.
The present inventor has intensively studied that, unlike the conventional collection in which the flocculant is added to the circulating water and further the modifier is added to make the spray mist of the UV paint into sludge that remains sticky. (Ultraviolet rays) can be uniformly irradiated, more efficiently and effectively cured, aggregated and solidified, and recovered.

In the present invention, for example, in a processing apparatus called a stirring and mixing type wet coating booth of FIG. 1, the spray mist 2 of UV paint is sucked by an exhaust fan (suction fan) (see 15 in FIG. 1). 2 is sprayed and collected by the mixing and stirring unit 8 by directly contacting and colliding with water at a high speed to be collided with water, thereby becoming a spray mist of UV paint dispersed and suspended in water, as shown in FIG. The spray mist of UV paint dispersed and suspended in water is irradiated with ultraviolet rays to harden, aggregate and solidify in water to separate into circulating water 5 and sludge 14.
Further, in the processing apparatus called the shower booth in FIG. 3, the spray mist 2 of UV paint riding on the air flow 12 comes into contact with the shower 22 of circulating water in the shower room (see 27 in FIG. 3). It is dropped and further irradiated with ultraviolet rays to be separated into circulating water 5 and sludge 14.
Examples of the UV paint that can be used in the present invention include acrylic resin-based, epoxy resin-based, polyurethane resin-based, unsaturated polyester resin-based, and the like.

For the circulating water used in the present invention, the generated strong alkaline electrolyzed water may be used.
Strong alkaline electrolyzed water is a solution with a large amount of electrons and has a strong intermolecular attractive force (electron peeling action). It has a bactericidal effect, and has a large amount of dissolved hydrogen and a small amount of dissolved oxygen. It prevents rot of electrolytic water itself and has a deodorizing action.
Since the amount of dissolved oxygen is 1/10 or less of pure water, it has the effect of forming a passive film on the metal surface and suppressing metal corrosion.

The output of the ultraviolet irradiation lamp used in the present invention is suitably 1 to 3 kw and the wavelength is 200 to 450 nanometers.
Irradiation with the ultraviolet irradiation lamp may be from the upper surface of the water surface or through the glass from the side surface, but the water depth is suitably about 100 to 500 millimeters.
The shape includes a light bulb type and a fluorescent tube type, but any shape may be used.

The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

1 spray gun
2 Paint spray mist
3 Workpiece
4 Storage tank (floating tank)
5 Circulating water
6 Scrubber
7 Clearance
8 Mixing and stirring section
9 Trap
10 Stirrer
11 UV irradiation machine (Model AGM-3 lamp manufactured by Ubui Technica)
12 Air flow
13 water drops
14 Sludge
15 Exhaust fan
16 Stirrer motor
17 Circulating water flow
18 Weir 1
19 Shower pump
20 Piping
21 Shower nozzle
22 shower
23 Weir 2
24 casing
25 glass containers
26 Coagulated and solidified sludge cured in water
27 Shower room
28 Eliminator
29 Floating tank (storage tank)

Claims (6)

In a method of collecting excess paint spray mist generated during spray coating of UV paint (hereinafter referred to as UV paint) that is cured by irradiating with ultraviolet rays, the spray mist is collected in water. And a step of subsequently irradiating ultraviolet rays (ultraviolet rays) to the water that collects the spray mist to cause a curing reaction in the water to cause aggregation and solidification, and separating the solid content. A method for treating spray mist of UV paint. The process of collecting the spray mist in water includes a process of collecting the spray mist by directly contacting the spray mist with water at high speed and collecting the spray mist according to claim 1. Method. The step of separating the solid content of the UV paint irradiates ultraviolet rays toward the water that collects the spray mist in a tank that stores and flows water for collecting the spray mist. The method of treating a UV paint spray mist according to claim 1 or 2, further comprising a step of curing the UV paint mist dispersed and suspended in water by water, and aggregating and solidifying the UV paint mist. The UV paint spray mist processing method according to claim 3, wherein the UV paint mist dispersed and suspended in water is uniformly irradiated with ultraviolet rays by stirring the water collected from the spray mist, A method of treating a spray mist of UV paint, comprising a step of effectively curing, aggregating and solidifying. The method for treating a spray mist of UV paint according to any one of claims 1 to 4, wherein the water from which the solid content has been separated is circulated and reused. The spray mist of UV paint according to any one of claims 1 to 5, wherein the water is water containing strong alkaline electrolyzed water and having a pH of 9 or more and an ORP of 200 mV or less. Processing method.